CN-122001350-A - Switching system and electrical device

CN122001350ACN 122001350 ACN122001350 ACN 122001350ACN-122001350-A

Abstract

The application provides a switching system and electrical equipment, and relates to the technical field of switching appliances. The switching system comprises a first switching unit, one end of the first switching unit is used for being connected with a positive electrode of a power supply, the other end of the first switching unit is used for being connected with a load, the first switching unit comprises a switching module and a current suppression module, the switching module comprises a semiconductor switch and a fault processing branch, the current suppression module is connected with the semiconductor switch in series and then connected with the fault processing branch in parallel, the switching module is used for performing fault processing when a circuit breaks down, and the current suppression module is used for suppressing impact current generated in the circuit when the load is connected. According to the scheme, after the current suppression module is connected with the semiconductor switch in the switch module in series, the current suppression module is connected with the fault processing branch in the switch module in parallel. The structure comprising two semiconductor switches in the original switching system is improved to comprise one semiconductor switch, so that the number of the semiconductor switches is reduced, and the circuit cost is effectively reduced.

Inventors

GONG ZUOYONG
PENG QIONG
Chang Hebin
WU YIFEI
LI ZHIHAO
ZHONG MINGTAO

Assignees

上海良信电器股份有限公司
西安交通大学

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. The switch system is characterized by comprising a first switch unit, wherein one end of the first switch unit is used for being connected with a positive electrode of a power supply, and the other end of the first switch unit is used for being connected with a load; the first switch unit comprises a switch module and a current suppression module; The switch module comprises a semiconductor switch and a fault processing branch circuit; The current suppression module is connected with the semiconductor switch in series and then connected with the fault processing branch in parallel; the switch module is used for carrying out fault processing when a circuit fails; The current suppression module is used for suppressing impact current generated in the circuit when the load is connected.
2. The switching system according to claim 1, wherein the current suppressing module comprises a first resistor, an inductor, and a driving control unit; A first end of the first resistor is connected with a second end of the semiconductor switch; the second end of the first resistor is connected with the first end of the inductor; the second end of the inductor is connected with one end of the fault processing branch; The first end of the driving and controlling unit is connected with the third end of the semiconductor switch, the second end of the driving and controlling unit is connected with the first end of the first resistor, and the third end of the driving and controlling unit is connected with the second end of the first resistor.
3. The switching system of claim 2, wherein the first switching unit further comprises a first mechanical switch; A first end of the first mechanical switch is connected with a first end of the first resistor; the second end of the first mechanical switch is connected with the second end of the inductor.
4. The switching system of claim 1, wherein the first switching unit further comprises an isolating switch; The first end of the isolating switch is connected with the positive electrode of the power supply; The second end of the isolating switch is connected with the first end of the semiconductor switch.
5. The switching system according to claim 1, wherein, The fault handling branch comprises a buffer branch and an energy absorbing branch; The current suppression module is connected with the semiconductor switch in series and then is connected with the buffer branch and the energy absorption branch in parallel.
6. The switching system of claim 5, wherein the buffer branch comprises a second resistor and a capacitor; The first end of the second resistor is connected with the first end of the semiconductor switch; the second end of the second resistor is connected with the first end of the capacitor; and the second end of the capacitor is connected with one end of the current suppression module connected with a load.
7. The switching system of claim 5, wherein the energy absorbing branch comprises an energy absorbing element; A first end of the energy absorbing element is connected to a first end of the semiconductor switch; the second end of the energy absorbing element is connected with one end of the current suppressing module connected with a load.
8. The switching system of claim 2, wherein the current suppression module further comprises a diode; the anode of the diode is used for being connected with a load and the cathode of the power supply respectively; the negative pole of diode is connected with the first end of inductance.
9. The switching system according to any one of claims 1-8, further comprising a second switching unit comprising a second mechanical switch; the first end of the second mechanical switch is connected with the positive electrode of the power supply; The second end of the second mechanical switch is used for connecting a load.
10. An electrical device comprising the switching system of any one of claims 1-9; the switching system is used for protecting the electric equipment.

Description

Switching system and electrical device Technical Field The application relates to the technical field of switching appliances, in particular to a switching system and electrical equipment. Background The solid-state switch is a power switching device based on semiconductor technology, and is mainly used for realizing quick switching-on and switching-off of a circuit and fault protection. In the circuit starting stage, an inductor is usually connected into a solid-state switch to form a switching system, so that fault misjudgment caused by impact current is effectively restrained. At present, in the existing switching system, the solid-state switch is connected with the combined inductor in parallel, and the solid-state switch and the combined inductor respectively comprise a semiconductor switch, so that the volume and the cost of the whole switching system are large due to the large volume and the large cost of the semiconductor switch, and therefore, a certain optimization space exists in the existing switching system. Disclosure of Invention The application aims to overcome the defects in the prior art and provide a switching system and electrical equipment, so that the switching system is optimized, and the circuit design cost is reduced. In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows: In a first aspect, an embodiment of the application provides a switch system, which comprises a first switch unit, a second switch unit and a third switch unit, wherein one end of the first switch unit is used for being connected with a positive electrode of a power supply, and the other end of the first switch unit is used for being connected with a load; the first switch unit comprises a switch module and a current suppression module; The switch module comprises a semiconductor switch and a fault processing branch circuit; The current suppression module is connected with the semiconductor switch in series and then connected with the fault processing branch in parallel; the switch module is used for carrying out fault processing when a circuit fails; The current suppression module is used for suppressing impact current generated in the circuit when the load is connected. Optionally, the current suppression module comprises a first resistor, an inductor and a driving control unit; A first end of the first resistor is connected with a second end of the semiconductor switch; the second end of the first resistor is connected with the first end of the inductor; the second end of the inductor is connected with one end of the fault processing branch; The first end of the driving and controlling unit is connected with the third end of the semiconductor switch, the second end of the driving and controlling unit is connected with the first end of the first resistor, and the third end of the driving and controlling unit is connected with the second end of the first resistor. Optionally, the first switch unit further comprises a first mechanical switch; A first end of the first mechanical switch is connected with a first end of the first resistor; the second end of the first mechanical switch is connected with the second end of the inductor. Optionally, the first switch unit further comprises an isolating switch; The first end of the isolating switch is connected with the positive electrode of the power supply; The second end of the isolating switch is connected with the first end of the semiconductor switch. Optionally, the fault handling branch comprises a buffer branch and an energy absorbing branch; The current suppression module is connected with the semiconductor switch in series and then is connected with the buffer branch and the energy absorption branch in parallel. Optionally, the buffer branch comprises a second resistor and a capacitor; The first end of the second resistor is connected with the first end of the semiconductor switch; the second end of the second resistor is connected with the first end of the capacitor; and the second end of the capacitor is connected with one end of the current suppression module connected with a load. Optionally, the energy absorbing branch comprises an energy absorbing element; A first end of the energy absorbing element is connected to a first end of the semiconductor switch; the second end of the energy absorbing element is connected with one end of the current suppressing module connected with a load. Optionally, the current suppression module further comprises a diode; the anode of the diode is used for being connected with a load and the cathode of the power supply respectively; the negative pole of diode is connected with the first end of inductance. Optionally, the switch system further comprises a second switch unit, wherein the second switch unit comprises a second mechanical switch; the first end of the second mechanical switch is connected with the positive electrode of the power supply; The second end o